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Old 06-04-2006, 08:12 PM
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Default RE: Homelite 45cc & Walbro HDB-6B

The throttle bore is 3/4th inch (19mm ) and the venturi is 16mm, but it has 40 cast into it, which is 15.88mm. I think that they are allowing for two flat areas in the venturi which reduce the effective area.